Apparatus for connecting a loom heald shaft to heald shaft tackle

ABSTRACT

An arrangement of suspension hook between the heald shaft of a loom and the tackle of a dobby wherein the tractive force of the tackle eliminates continuously the play resulting from wear.

United States Patent 15] 3,683,970 Wicker 21451 Aug. 15,1972

[54] APPARATUS FOR CONNECTING A 3,074,438 1/1963 1 Svaty ..139/91 LOOM HEALD SHAFT TO HEALD 3,155,118 1 1 1/1964 SHAFT TACKLE ,1 3, 2/l

2,676,619 4 1954 C l tt' ..l39 88 [72] Inventor: Walter Wicker, Oberrieden-Zurich, onsoe l 1 Switzerland. FOREIGN PATENTS OR APPLICATIONS [73] Assignee: Staubli Ltd., Horgen, Switzerland 488,830 5/197 Switzerland 11 7 1,221,421 1/1960 France ..139/57 [22] June 11,197 465,526 1 12/1968 Switzerland.... [21] AppI.No.: 45,302 505,161 5/1939 Great Britain" 113,529 1/1926 Switzerland ..139/57 [30] Foreign Application Priority Data Prim Emmner james Kee Chi June 13, 1969 Switzerland ..9032/69 Anomeyw odhams, Blanchard and Flynn [52] u.s.c| ..139/s7,139/91 [571 ABSTRACT [51] II'ILCI. ..D03 13/00, D03C 9/06 An arrangement of uspension hook between the Field Search "11 2, heald shaft of a loom and the tackle of a dobby 139/33, 58 wherein the tractive force of the tackle eliminates continuously the play resulting from wear. 6 f [5 Re erences Cited 6 Claims, 2 Drawing Figures UNITED STATES PATENTS v 2,069,330 2/1937 Rossmann ..l39/57 X l 1i l ii Patented Aug. 15, 1972 INVENTOR WAZ/YE W IC/KEE I V/ /////l APPARATUS FOR CONNECTING A LOOM HEALD SHAFT T HEALD SHAFT TACKLE This invention relates to an apparatus for connecting a loom heald shaft to heald shaft tackle.

With fast running looms large forces occur at the connection between the heald shaft tackle and the shaft frame since the heald shaft is repeatedly moved at short time intervals from the lowest or highest position to the highest or lowest position respectively. For this reason jerky movements of the shafts and stresses which occur when the movement is beginning lead to wear in the connections. In particular, enlargement of fixing holes and deflection of the shaft frame stays tend to result. Moreover damage to the healds can also result therefrom. Once the heald shaft tackle exhibits any play in its moving parts this being additional to any forces normally present such play increases the forces giving rise to damage.

The present invention provides an apparatus for connecting a loom heald shaft to heald shaft tackle, comprising one or more bell-crank levers pivotally mounted on a beam supporting the heald shaft with one arm of the or each lever having an adjustable connection with the heald shaft and the other arm of the or each lever being connected with the tackle such that a tractive force produced by the tackle on said lever effects continuous readjustment of the connection between said lever and said heald shaft to eliminate play in said connection.

Preferably, the adjustable connection between the or each double lever and the heald shaft consists of a cranked lever end having a wedge-shaped form extending substantially transversely to the direction of the tractive force and a block mountedon the shaft, the block having a wedge-shaped recess into which cranked lever end fits, whereby due to the wedgeshaped form there is an automatic adjustment of the surfaces of contact. This gives at any time a connection without play.

With the use of a bell-crank lever or levers, changes of healds or tackles can be effected simply, by reason of the fact that the shaft can be removed and replaced by swivelling off the or each lever.

The accompanying drawings show by way of example one method of carrying out the invention. In the drawings:

FIG. I is a diagrammatic side view of a loom heald shaft and heald shaft tackle; and

FIG. 2 is a sectional view on a larger scale of a part of the apparatus shown in FIG. 1. shown),

In FIG. 1 all secondary components, such as driving and lead-in organs, which are not important by way of explanation of the invention, have been omitted. At 1 is shown a loom heald shaft frame which is supported on a beam carrier 3 by a base 2. The beam itself is suspended by springs 4 from the machine framework 5. In the case of the loom shown without superstructure the heald shaft tackle 6 is arranged below the shaft and leads over guide rollers 7 to a jack lever 8 of a shed forming machine (not shown), for example, a dobby or treadle motion.

Referring to the left hand side of FIG. 2, a bell-crank angle, so that it lies transversely of the direction of a tractive force Z produced on the lever by the heald shaft tackle 6. The end 13 has a wedge-like shape and engages in a correspondingly formed recess 14 of a block 15 of the shaft frame 1. At the end of the arm 11 is a hook 18, from which the heald shaft tackle is hung.

The two arms 11 and 12 of the lever form an obtuse angle, so that the arm 12 being arranged vertically to the shaft frame the tackle 6 connected to the arm 11 exerts a turning moment on the lever 10 around the pivot 9. Said turning moment causes that under the tractive force Z the end 13 is pressed in the direction of arrow E into the recess 14. Thus any play between the double lever 10 and shaft frame even if wear and tear should have manifested themselves is annulled and automatic adjustability of the connection l3, 14 is obtained.

The recess 14 is in a block 15 which is accommodated in a hollow space 16 of the shaft frame 1.

Where there are two heald shaft tackles provided for the same heald frame, levers 10 and 10' are so arranged that the arms 12 and 12' each exert effective pressure in opposite directions on the shaft frame 1, i.e. the ends 13 and 13' are directed away from one another or towards each other. 7

So that in case of an unintended release of the heald shaft tackle the end 13 of the double lever 10 cannot come out of the recess 14, whereby the heald shaft would be disconnected; a leaf spring 17 can be arranged to press against the arm 12.

For the purpose of disconnecting the shaft frame 1 it suffices to release the heald shaft tackle 6 whereupon, by swinging away the levers 10 and 10', the connections with the heald shaft can be loosened. The substitution of a new heald shaft can then be simply effected. Changes of healds (harness) are thus simple.

The device as described can be employed with all negative dobbies.

The embodiments of the invention in which an exclusive property or privilage is claimed are defined as follows:

1. Apparatus for connecting a loom heald shaft supported by a beam to heald shaft tackle, comprising:

means defining a recess on said heald shaft; at least one bell-crank lever pivotally mounted on said beam;

one arm of said lever having adjustable projection means thereon, said adjustable projection means being adapted to pivot with said one arm into and out of said recess means;

the other arm of said lever on the opposite side of said pivotal mounting extending transversely of said one arm and being connected with said tackle so that a force applied to said other arm by said tackle will effect a pivotal movement of said lever to thereby urge said adjustable projection means into said recess to facilitate a continuous readjustment of the adjustable projection means in said recess means to thereby eliminate play created by repeated relative movements between said lever and said heald shaft.

2. Apparatus according to claim 1, wherein said adjustable projection means on said one arm of said lever comprises a wedge-shaped form extending substantially transversely to the direction of the applied force and wherein said recess means comprises a block mounted on said heald shaft, said block having a wedge-shaped recess therein corresponding to the shape of the wedgeshaped form and into which said wedge-shaped form is received.

3. Apparatus according to claim 1, wherein said beam is hollow and includes means defining an opening therein and wherein the lever passes through the opening in said beam into a hollow space in said heald shaft frame, said recess means being mounted in said hollow space.

4. Apparatus according to claim 1, including a pair of said bell-crank levers for each heald frame, wherein said recess means comprises a pair of opposed recesses in said heald shaft and wherein said adjustable projection means on said one arm of each of said levers extend in opposite direction from their respective lever arms into the respective one of said recesses.

5. Apparatus according to claim 1, including a spring for urging said lever into said recess means towards a means being pivotal with said one arm into and out' of engagement with said first connecting means about the axis defined by said pivotal mounting of said lever, said first and second connecting means comprising self-adjusting means for automaticallycompensating for wear occurring in said connecting means due to repeated relative movements therebetween. 

1. Apparatus for connecting a loom heald shaft supported by a beam to heald shaft tackle, comprising: means defining a recess on said heald shaft; at least one bell-crank lever pivotally mounted on said beam; one arm of said lever having adjustable projection means thereon, said adjustable projection means being adapted to pivot with said one arm into and out of said recess means; the other arm of said lever on the opposite side of said pivotal mounting extending transversely of said one arm and being connected with said tackle so that a force applied to said other arm by said tackle will effect a pivotal movement of said lever to thereby urge said adjustable projection means into said recess to facilitate a continuous readjustment of the adjustable projection means in said recess means to thereby eliminate play created by repeated relative movements between said lever and said heald shaft.
 2. Apparatus according to claim 1, wherein said adjustable projection means on said one arm of said lever comprises a wedge-shaped form extending substantially transversely to the direction of the applied force and wherein said recess means comprises a block mounted on said heald shaft, said block having a wedge-shaped recess therein corresponding to the shape of the wedge-shaped form and into which said wedge-shaped form is received.
 3. Apparatus according to claim 1, wherein said beam is hollow and includes means defining an opening therein and wherein the lever passes through the opening in said beam into a hollow space in said heald shaft frame, said recess means being mounted in said hollow space.
 4. Apparatus according to claim 1, including a pair of said bell-crank levers for each heald frame, wherein said recess means comprises a pair of opposed recesses in said heald shaft and wherein said adjustable projection meaNs on said one arm of each of said levers extend in opposite direction from their respective lever arms into the respective one of said recesses.
 5. Apparatus according to claim 1, including a spring for urging said lever into said recess means towards a position for minimizing play in the adjustable connection between said lever and said heald shaft.
 6. Apparatus for connecting a loom heald shaft supported by a beam to heald shaft tackle, comprising: first connecting means on said heald shaft; at least one bell-crank lever pivotally mounted on said beam, one arm of said lever having second connection means thereon adapted to cooperate with said first connecting means to couple said heald shaft to said lever, said second connecting means being pivotal with said one arm into and out of engagement with said first connecting means about the axis defined by said pivotal mounting of said lever, said first and second connecting means comprising self-adjusting means for automatically compensating for wear occurring in said connecting means due to repeated relative movements therebetween. 